How to print RSA private key contents in text format using OpenSSL "rsa" command?

If you want to see contents of an RSA private key in text format, you can use the OpenSSL "rsa -text" command as shown below:

C:\Users\fyicenter>\local\openssl\openssl.exe

OpenSSL> rsa -in my_rsa.key -text -noout
Private-Key: (2048 bit)
modulus:
    00:c7:54:90:53:51:9f:b0:13:41:e9:75:36:9e:aa:
    f0:20:79:b5:22:65:cf:01:cb:08:9d:03:5f:84:57:
    29:ce:99:2e:dc:a9:a6:d0:ba:43:64:5d:68:aa:4a:
    8b:34:b9:61:d2:a5:48:22:57:ee:30:d9:d5:34:b0:
    28:cd:b5:1b:68:96:a5:15:47:52:18:f0:15:97:b8:
    c5:45:9c:69:0d:a8:be:77:85:36:c1:ed:78:30:ed:
    e4:4f:0c:bb:1f:76:5e:44:ac:d6:92:52:f6:14:27:
    8a:a3:67:36:d2:0c:c5:39:fc:5d:78:fc:12:c7:d9:
    41:4f:b7:9f:14:d7:39:34:74:4f:74:f6:cf:fd:ed:
    59:c7:55:6a:07:cc:00:29:38:11:c1:a7:d0:98:57:
    d8:51:b6:e4:d8:27:39:7e:d6:7c:ca:15:9c:e3:7f:
    b6:a9:6c:e1:5a:6e:88:83:c9:27:6d:aa:4f:2c:c3:
    f0:e9:b1:73:c0:3f:9c:93:ee:9d:ef:36:c2:1b:ef:
    8d:ac:1b:97:1f:ce:7c:88:32:5f:cc:b8:2b:c2:27:
    3b:7d:6d:1c:46:21:7e:c8:1a:62:4e:60:30:e8:6f:
    47:1f:40:90:bb:c1:cd:06:03:1f:5d:92:2e:62:36:
    44:47:83:0e:6e:6a:92:1a:24:53:c8:df:66:10:5b:
    52:5b
publicExponent: 65537 (0x10001)
privateExponent:
    00:9c:03:6d:1f:39:90:d2:40:90:63:48:d1:e2:68:
    8a:9f:f0:82:bc:94:90:ec:a7:5c:6b:80:7b:5f:5a:
    d5:a7:15:b0:5f:18:0e:2f:ea:c9:da:a1:5d:cd:83:
    a0:e7:38:7d:ff:60:4c:50:4d:20:6a:6d:e4:f9:63:
    33:dc:a5:f6:f8:ea:87:f5:5a:a8:40:4a:91:ab:f9:
    fb:b5:9b:51:82:56:64:15:aa:57:8c:7b:f0:89:e3:
    78:c2:02:85:e7:7f:3f:13:63:70:62:80:ba:88:55:
    d6:a6:44:9f:dc:d2:10:00:6d:ad:3f:87:94:af:85:
    35:20:4e:e9:1d:67:c3:27:70:cc:1d:f5:75:dc:ca:
    42:5d:b0:cd:09:7b:d4:a4:ec:fd:95:a8:9f:4b:d3:
    00:34:c3:12:64:fb:35:20:08:b4:40:ea:b6:ce:6a:
    eb:6a:be:a8:38:34:7e:82:df:b9:ef:5b:a6:32:94:
    b6:ee:12:52:ab:9e:6a:7e:d7:c6:84:53:ec:30:04:
    f8:7b:91:7f:dd:c0:f7:b9:f0:0d:bc:b5:9d:85:1d:
    e1:c2:cb:40:85:a0:0d:b2:9d:de:12:f5:e4:c9:1c:
    bf:7a:26:71:03:a0:e8:77:11:77:fc:2f:36:be:93:
    ab:03:0e:5d:4f:47:36:4b:1a:bb:e9:dc:87:8e:cc:
    ce:61
prime1:
    00:e6:3d:cd:6d:77:84:8e:c0:20:d8:68:2d:80:e2:
    4d:42:88:c0:40:c1:74:0a:e1:1c:53:e0:85:5c:b2:
    3a:7e:11:34:2f:63:3b:32:ca:06:c3:f8:d8:96:8e:
    61:f3:1f:26:8f:1c:5a:cc:04:32:a0:86:d0:ff:00:
    a6:74:61:92:d0:ad:bd:50:ac:fe:a5:e8:9c:2e:fe:
    4c:c7:9f:4e:d3:3e:bc:a9:e7:09:f5:89:28:ed:8c:
    bc:8a:4f:b9:b6:53:d8:55:5c:a4:a5:61:35:e5:32:
    5d:44:4b:87:55:0e:f1:3c:cd:05:35:c7:52:64:b2:
    0d:e0:bf:2b:76:f9:f6:9d:2b
prime2:
    00:dd:a1:74:e0:2c:f6:f6:a8:4e:3b:8a:b4:1f:14:
    eb:fc:17:3d:af:f2:96:44:26:99:85:be:2d:06:14:
    d9:e6:11:e0:28:0f:29:f3:43:3c:ff:09:c6:6b:ef:
    79:13:bd:e0:06:b8:cb:31:d4:1b:3d:bc:ac:53:51:
    1a:73:49:34:86:f9:28:59:5f:06:72:62:7a:1e:03:
    27:28:cf:6a:05:fa:52:da:72:e9:be:b8:c6:9f:94:
    f8:f5:1c:8f:5a:5e:c3:07:95:d0:05:98:3b:81:18:
    f4:61:39:29:ee:7d:f6:9f:2b:1c:ab:76:9d:e5:7a:
    7d:08:af:ef:ec:ef:50:67:91
exponent1:
    7e:b7:42:e9:5d:5f:0a:45:b9:8e:01:00:12:2f:fa:
    7f:84:cd:f2:95:c5:ec:fa:e9:e1:4b:ef:7a:0d:e9:
    5d:5a:d0:92:c8:15:5b:a5:8e:c5:aa:9e:61:76:29:
    78:6a:0b:89:b5:fc:4e:ce:7c:a2:96:b0:4d:b8:28:
    e4:62:93:2f:e0:7f:11:f8:b4:09:d1:94:ab:d4:6f:
    a3:6a:0d:32:fc:13:4f:9b:05:83:2a:22:e9:62:8c:
    9d:be:b5:22:20:d1:2e:61:d7:87:e1:91:8c:fc:04:
    12:c3:52:cf:40:73:0a:98:77:a6:9a:75:c1:4f:b1:
    8d:a1:09:25:e8:fa:8e:93
exponent2:
    19:76:f5:a0:d4:49:c3:e9:6e:a3:b4:ba:21:60:1c:
    05:28:fe:73:7a:e1:fd:0e:9a:51:1d:9a:ba:ba:26:
    97:22:b2:a8:a7:a5:60:47:f7:78:2e:3d:58:25:79:
    b9:e4:f5:1a:90:9c:f8:2a:b0:be:95:31:0f:99:9f:
    fa:63:0c:df:fd:3c:bf:98:05:7b:9b:09:00:ed:c7:
    d0:0e:94:d5:fe:ff:0a:0e:6e:00:f5:e6:0c:6b:e7:
    76:f2:43:1e:55:08:ff:94:1d:04:a7:8b:1e:b8:29:
    4c:0a:6f:60:f1:a4:26:81:a3:97:a7:d7:58:88:8c:
    59:35:2d:d2:01:65:31:a1
coefficient:
    4a:72:e8:f6:9a:47:4d:ee:ee:70:92:3f:8f:e9:37:
    68:c6:83:c5:0d:dd:d1:7d:1c:68:ae:19:c6:2e:29:
    44:91:a8:50:aa:34:f7:d8:a7:9d:53:78:22:6d:b3:
    8e:b3:f1:ee:96:f4:f2:67:a6:8f:9c:15:f5:95:65:
    59:8c:5c:18:e6:de:5b:8f:30:71:79:c2:83:34:0d:
    c6:42:86:90:bb:15:eb:a9:db:f6:1c:33:8d:25:b9:
    fa:84:c2:39:bb:6a:dd:35:f0:20:97:34:41:cb:07:
    4a:89:82:03:bd:a4:8e:ed:f7:43:51:53:73:48:9d:
    8b:42:c6:7d:0f:08:d1:4a

This test tells us that an RSA key (private key and public key pair) is made of:

modulus, also called n: The modulus part of the private key and the public key
publicExponent, also called e: The exponent part of the public key
privateExponent, also called d: The exponent part of the private key
prime1, also called p: The first prime number
prime2, also called q: The second prime number
coefficient, also called qInv (Inverse of q): qInv * q  mod p = 1
exponent1, also called dp: d mod (p-1)
exponent2, also called dq: d mod (q-1)

Options used in this command are:

• "-in my_rsa.key" - Read the RSA key file from: C:\Users\fyicenter\my_rsa.key
• "-text" - Print out key information in text format.
• "-noout" - Do not include the key itself in the output.

⇒ OpenSSL "rsa -pubout" - Extract RSA Public Key

⇐ OpenSSL "rsa" Command Options

⇑ OpenSSL "genrsa" and "rsa" Commands

⇑⇑ OpenSSL Tutorials